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6. 18. __. __. t. 45. 6. 42. __. __. 8. n. 21. x. __. __. 11. 44. Do Now. Find the missing value in each ratio. 1. = 2 . = 3 . =. t = 15. n = 56. x = 84. 10/28/2013 3-3 C Ratio and Rate Problems. 2. 4. __. __. =. 1. 2.

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Do now

6

18

__

__

t

45

6

42

__

__

8

n

21

x

__

__

11

44

Do Now

Find the missing value in each ratio.

1. =

2. =

3.=

t = 15

n = 56

x = 84



2

4

__

__

=

1

2

To solve ratio and rate problems, we can use

  • Equivalent ratios/ Proportions

  • Multiplication and Division


Example 1

in a club

in a club

?

2

_____

___

=

total

total

300

5

Example 1

Pine Hill Middle School has 300 students. In Zoey’s class, two out of five students belong to a club. Use this ratio to predict how many students at Pine Hill Middle School belong to a club.

We can predict that 120 students belong to a club.


Example 2
Example 2

In a survey, the ratio of students who prefer soccer to baseball is 2 to 3. The number of people who prefer soccer is 36. How many people in the survey prefer baseball?


Or use equivalent fractions proportions

36

soccer

soccer

2

2

_____

=

___

___

baseball

baseball

?

3

3

×18

36

_____

=

54

×18

Or use equivalent fractions (proportions)

Since 2  18 = 36, multiply 3 by 18.

54 people in the survey prefer baseball.



Example 3
Example 3

There are 57 ounces of dog biscuits in 5 boxes. At this rate, how many ounces of dog biscuits are in 8 boxes?


÷5

11.4 ounces

______________

× 8 boxes = 91.2 ounces

1 box

57 ounces

57 ounces

11.4 ounces

? ounces

____________

____________

___________

___________

=

=

÷5

5 boxes

5 boxes

1 box

1 box



In a survey, seven out of ten people preferred apple pie over cherry pie. There are 250 people shopping at the grocery store. Use the survey to predict how many people in the store would prefer apple pie.

1.)

2.)

175 people

A recipe for lasagna calls for 15 ounces of ricotta cheese for 12 servings. How many ounces of cheese are needed for 20 servings?

25 ounces


LUNCH PERIODS A survey found that 5 out of every 8 students would prefer an earlier lunch period. If 120 students chose an earlier lunch on the survey, how many students took the survey?


Homework
Homework

Pg. 183 #1-22 Evens

1 Typing Test

Test on Wednesday

Quiz Corrections due next Monday


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